桩基沉降计算桩形状:圆形桩直径d或边长b:0.80m桩面积Ap:0.503m2编号桩端底土层名称在荷载效应准永久组合下承台底的平均附加压力F:8000KN00按荷载效应准永久组合计算的假想天然地基平均附加应力P0:500Kpa1粘土2粘土实际承台长度Lc:4m3粘土实际承台宽度Bc:4m4粘土承台总面积A:16.00m25粘土基础长宽比Lc/Bc:1.00总桩数n:4桩长L:20msum桩距Sa:2.40m是否规则布桩?是附加应力σz:距径比Sa/d:3.0自重应力0.2σc:长径比L/d:25.0沉降计算长度Zn判断:短边布桩数nb:2C0:0.055C1:1.542C2:8.741桩基等效沉降系数ψe:0.152平均压缩模量Es:19.1Mpa桩基沉降计算经验系数ψ:0.697桩基中心点沉降量S:11.10mm注:1、对于采用后注浆施工工艺的灌注桩,桩基沉降计算经验系数应根据桩端持力土层类别,乘以0.7(砂、砾、卵石)~0.8(黏性土、粉土)折减系数;2、饱和土中采用预制桩(不含复打、复压、引孔沉桩)时,应根据桩距、土质、沉桩速率和顺序等因素,乘以1.3~1.8挤土效应系数,土的渗透性低,桩距小,桩数多,沉降速率快时取大值。土层沉降计算表格Esi(Mpa)土层深度zi(m)土层厚度li(m)土重度(KN/m3)长宽比a/b深宽比zi/Bc角点平均附加应力系数αiziαiziαi-zi-1αi-10000000.25000.0000.000182291.001.000.22520.4500.450164291.002.000.17460.6980.248206291.003.000.13690.8210.123228291.004.000.11140.8910.07043181091.009.000.05540.9970.1060.0554110.80Mpa122.40MpaOK(ziαi-zi-1αi-1)/EsAiAi/Esiσc(Kpa)0.0000.0000.000450.0000.0250.4500.025468.0000.0160.2480.016486.0000.0060.1230.006504.0000.0030.0700.003522.0000.0020.1060.002612.0000.0520.9970.052612